Ronstan RF41300 Series 40 Triple Block with Swivel Head

The Ronstan Series 40 All Purpose Block is a high-performance triple sheave block with swivel head designed for demanding sailing applications. Built for both cruising and racing, this block delivers exceptionally high working loads with low maintenance requirements and extended service life.

Key Features:

• Triple sheave configuration with swivel head for versatile line routing
• Self-lubricating UV-stabilized Acetal polymer sheaves running on polished stainless steel races
• Slotted pin shackle design prevents line fouling
• Two-way head post for flexible attachment options
• Performs equally well under dynamic loads and high static loads
• Impact and UV-resistant fiber-reinforced Nylon cheeks

Ideal Applications:

• Mainsheet systems
• Halyards
• Boom vangs
• Spinnaker control lines on off-the-beach catamarans, one-design classes, and sportsboats up to 8m (26ft)

Construction Materials:

• Sheaves: UV-stabilized Acetal polymer
• Cheeks: Impact-modified, fiber-reinforced, UV-stabilized Nylon
• Bearing race: Grade 316 stainless steel
• Load strap and head fitting: Grade 316 stainless steel

Replacement Parts: RF41010 Replacement Becket Pin, RF150 Shackle

The Series 40 All Purpose Block is an excellent all-around solution for sheets, halyards, and control line applications where durability and reliability are essential.